atomic number 17 / chlorine / Cl= a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant

atomic number 15 / phosphorus / P= a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells

atomic number 94 / plutonium / Pu= a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors

atomic number 86 / radon / Rn= a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses

atomic number 34 / selenium / Se= a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells

atomic number 14 / silicon / Si= a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand

A chemical element with atomic number 37. Rubidium was discovered in 1860 by
Robert Bunsen and Gustav Kirchoff in the mineral lepidolite. The name rubidium
is derived from rubidus, Latin for deep red coloured. Symbol: Rb. ru-the-ni-um ...

performed using an incident energy close to that of an absorption edge of a
chemical element present in the sample. Under these conditions the atomic
scattering factor of the element is modified by a factor (called the anomalous
dispersion ...

A chemical element having atomic number 25, atomic weight 55, and the symbol
Mn. It was named for magnes, the Latin word for magnet, because of the
magnetic properties of pyrolusite in which manganese was found. The element
was ...

A chemical element is a basic substance. It cannot be broken down into simpler
substances by ordinary chemical processes. Chemical elements are the building
blocks for all matter—that is, everything that takes up space in the universe.

chemical element of a notable accident in 1957; the cooling system of a
radioactive waste containment unit malfunctioned and exploded, releasing about
two million curies and exposing a quarter of a million people to radiation.
chemical ...

For the same chemical element, the number
of neutrons may vary without affecting the identity of the element. Versions of an
element with different numbers of neutrons are called ISOTOPEs of that element.